Arithmetic operators

expression + expression Addition. If either expression is NULL, the result is NULL.

expression - expression Subtraction. If either expression is NULL, the result is NULL.

- expression Negation. If the expression is NULL, the result is NULL.

expression * expression Multiplication. If either expression is NULL, the result is NULL.

expression / expression Division. If either expression is NULL or if the second expression is 0, the result is NULL.

expression % expression Modulo finds the integer remainder after a division involving two whole numbers. For example, 21 % 11 = 10 because 21 divided
by 11 equals 1 with a remainder of 10. If either expression is NULL, the result is NULL.